For the past few weeks, I've been having a weird issue: Often, I'll be using my laptop, and out of nowhere I lose control over my volume. It will be stuck at whatever volume I had it before this occurred. Clicking the volume buttons (F10, F11, F12) makes the little changing volume noise (sounds like a drop of water?), but the volume doesn't actually change. Same thing if I try to change the volume in Sound in System Preferences. It says my volume is increasing, only it's not. My only control over volume is then in applications - for example, if I'm watching a movie in VLC, I can increase the volume within the media player, or if I'm listening to a song in iTunes, I can change the volume within iTunes. However, if I had my volume set low before it decided to stop working, even bringing an application's volume to the maximum isn't very much help. It almost always is fixed when I restart my computer. Generally the volume will function fine for two or three minutes after restarting my computer, and then it will suddenly stop letting me control it. It's getting pretty annoying to restart my computer all the time. Any ideas? Edit: I have a MacBook from early 2009ish.